How to use the stix2.base._Observable function in stix2

def _custom_observable_builder(cls, type, properties, version):
    class _CustomObservable(cls, _Observable):

        if not re.match(TYPE_REGEX, type):
            raise ValueError(
                "Invalid observable type name '%s': must only contain the "
                "characters a-z (lowercase ASCII), 0-9, and hyphen (-)." % type,
            )
        elif len(type) < 3 or len(type) > 250:
            raise ValueError("Invalid observable type name '%s': must be between 3 and 250 characters." % type)

        if not properties or not isinstance(properties, list):
            raise ValueError("Must supply a list, containing tuples. For example, [('property1', IntegerProperty())]")

        if version == "2.0":
            # If using STIX2.0, check properties ending in "_ref/s" are ObjectReferenceProperties
            for prop_name, prop in properties:
                if prop_name.endswith('_ref') and ('ObjectReferenceProperty' not in get_class_hierarchy_names(prop)):

('pe_type', StringProperty(required=True)),  # open_vocab
        ('imphash', StringProperty()),
        ('machine_hex', HexProperty()),
        ('number_of_sections', IntegerProperty(min=0)),
        ('time_date_stamp', TimestampProperty(precision='second')),
        ('pointer_to_symbol_table_hex', HexProperty()),
        ('number_of_symbols', IntegerProperty(min=0)),
        ('size_of_optional_header', IntegerProperty(min=0)),
        ('characteristics_hex', HexProperty()),
        ('file_header_hashes', HashesProperty(spec_version='2.1')),
        ('optional_header', EmbeddedObjectProperty(type=WindowsPEOptionalHeaderType)),
        ('sections', ListProperty(EmbeddedObjectProperty(type=WindowsPESection))),
    ])


class File(_Observable):
    # TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.
    """

    _type = 'file'
    _properties = OrderedDict([
        ('type', TypeProperty(_type)),
        ('id', IDProperty(_type, spec_version='2.1')),
        ('hashes', HashesProperty(spec_version='2.1')),
        ('size', IntegerProperty(min=0)),
        ('name', StringProperty()),
        ('name_enc', StringProperty()),
        ('magic_number_hex', HexProperty()),
        ('mime_type', StringProperty()),
        # these are not the created/modified timestamps of the object itself

if self.get('resolves_to_refs'):
            warnings.warn(
                "The 'resolves_to_refs' property of ipv4-addr is deprecated in "
                "STIX 2.1. Use the 'resolves-to' relationship type instead",
                STIXDeprecationWarning,
            )

        if self.get('belongs_to_refs'):
            warnings.warn(
                "The 'belongs_to_refs' property of ipv4-addr is deprecated in "
                "STIX 2.1. Use the 'belongs-to' relationship type instead",
                STIXDeprecationWarning,
            )


class IPv6Address(_Observable):
    # TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.
    """

    _type = 'ipv6-addr'
    _properties = OrderedDict([
        ('type', TypeProperty(_type)),
        ('id', IDProperty(_type, spec_version='2.1')),
        ('value', StringProperty(required=True)),
        ('resolves_to_refs', ListProperty(ReferenceProperty(valid_types='mac-addr', spec_version='2.1'))),
        ('belongs_to_refs', ListProperty(ReferenceProperty(valid_types='autonomous-system', spec_version='2.1'))),
        ('extensions', ExtensionsProperty(spec_version='2.1', enclosing_type=_type)),
        ('spec_version', StringProperty(fixed='2.1')),
        ('object_marking_refs', ListProperty(ReferenceProperty(valid_types='marking-definition', spec_version='2.1'))),
        ('granular_markings', ListProperty(GranularMarking)),

('path_enc', StringProperty()),
        # these are not the created/modified timestamps of the object itself
        ('ctime', TimestampProperty()),
        ('mtime', TimestampProperty()),
        ('atime', TimestampProperty()),
        ('contains_refs', ListProperty(ReferenceProperty(valid_types=['file', 'directory'], spec_version='2.1'))),
        ('extensions', ExtensionsProperty(spec_version='2.1', enclosing_type=_type)),
        ('spec_version', StringProperty(fixed='2.1')),
        ('object_marking_refs', ListProperty(ReferenceProperty(valid_types='marking-definition', spec_version='2.1'))),
        ('granular_markings', ListProperty(GranularMarking)),
        ('defanged', BooleanProperty(default=lambda: False)),
    ])
    _id_contributing_properties = ["path"]


class DomainName(_Observable):
    # TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.
    """

    _type = 'domain-name'
    _properties = OrderedDict([
        ('type', TypeProperty(_type)),
        ('id', IDProperty(_type, spec_version='2.1')),
        ('value', StringProperty(required=True)),
        ('resolves_to_refs', ListProperty(ReferenceProperty(valid_types=['ipv4-addr', 'ipv6-addr', 'domain-name'], spec_version='2.1'))),
        ('extensions', ExtensionsProperty(spec_version='2.1', enclosing_type=_type)),
        ('spec_version', StringProperty(fixed='2.1')),
        ('object_marking_refs', ListProperty(ReferenceProperty(valid_types='marking-definition', spec_version='2.1'))),
        ('granular_markings', ListProperty(GranularMarking)),
        ('defanged', BooleanProperty(default=lambda: False)),

class UNIXAccountExt(_Extension):
    # TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.
    """

    _type = 'unix-account-ext'
    _properties = OrderedDict([
        ('gid', IntegerProperty()),
        ('groups', ListProperty(StringProperty)),
        ('home_dir', StringProperty()),
        ('shell', StringProperty()),
    ])


class UserAccount(_Observable):
    # TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.
    """

    _type = 'user-account'
    _properties = OrderedDict([
        ('type', TypeProperty(_type)),
        ('id', IDProperty(_type, spec_version='2.1')),
        ('user_id', StringProperty()),
        ('credential', StringProperty()),
        ('account_login', StringProperty()),
        ('account_type', StringProperty()),   # open vocab
        ('display_name', StringProperty()),
        ('is_service_account', BooleanProperty()),
        ('is_privileged', BooleanProperty()),

def __deepcopy__(self, memo):
        # Assume: we can ignore the memo argument, because no object will ever contain the same sub-object multiple times.
        new_inner = copy.deepcopy(self._inner, memo)
        cls = type(self)
        if isinstance(self, _Observable):
            # Assume: valid references in the original object are still valid in the new version
            new_inner['_valid_refs'] = {'*': '*'}
        new_inner['allow_custom'] = self._allow_custom
        return cls(**new_inner)

('id', IDProperty(_type, spec_version='2.1')),
        ('name', StringProperty(required=True)),
        ('cpe', StringProperty()),
        ('languages', ListProperty(StringProperty)),
        ('vendor', StringProperty()),
        ('version', StringProperty()),
        ('extensions', ExtensionsProperty(spec_version='2.1', enclosing_type=_type)),
        ('spec_version', StringProperty(fixed='2.1')),
        ('object_marking_refs', ListProperty(ReferenceProperty(valid_types='marking-definition', spec_version='2.1'))),
        ('granular_markings', ListProperty(GranularMarking)),
        ('defanged', BooleanProperty(default=lambda: False)),
    ])
    _id_contributing_properties = ["name", "cpe", "vendor", "version"]


class URL(_Observable):
    # TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.
    """

    _type = 'url'
    _properties = OrderedDict([
        ('type', TypeProperty(_type)),
        ('id', IDProperty(_type, spec_version='2.1')),
        ('value', StringProperty(required=True)),
        ('extensions', ExtensionsProperty(spec_version='2.1', enclosing_type=_type)),
        ('spec_version', StringProperty(fixed='2.1')),
        ('object_marking_refs', ListProperty(ReferenceProperty(valid_types='marking-definition', spec_version='2.1'))),
        ('granular_markings', ListProperty(GranularMarking)),
        ('defanged', BooleanProperty(default=lambda: False)),
    ])

def _check_property(self, prop_name, prop, kwargs):
        super(_Observable, self)._check_property(prop_name, prop, kwargs)
        if prop_name not in kwargs:
            return

        from .properties import ObjectReferenceProperty
        if prop_name.endswith('_ref'):
            if isinstance(prop, ObjectReferenceProperty):
                ref = kwargs[prop_name]
                self._check_ref(ref, prop, prop_name)
        elif prop_name.endswith('_refs'):
            if isinstance(prop.contained, ObjectReferenceProperty):
                for ref in kwargs[prop_name]:
                    self._check_ref(ref, prop, prop_name)

def _check_object_constraints(self):
        # no need to check windows-service-ext, since it has a required property
        super(Process, self)._check_object_constraints()
        try:
            self._check_at_least_one_property()
            if 'windows-process-ext' in self.get('extensions', {}):
                self.extensions['windows-process-ext']._check_at_least_one_property()
        except AtLeastOnePropertyError as enclosing_exc:
            if 'extensions' not in self:
                raise enclosing_exc
            else:
                if 'windows-process-ext' in self.get('extensions', {}):
                    self.extensions['windows-process-ext']._check_at_least_one_property()


class Software(_Observable):
    # TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.
    """

    _type = 'software'
    _properties = OrderedDict([
        ('type', TypeProperty(_type)),
        ('id', IDProperty(_type, spec_version='2.1')),
        ('name', StringProperty(required=True)),
        ('cpe', StringProperty()),
        ('languages', ListProperty(StringProperty)),
        ('vendor', StringProperty()),
        ('version', StringProperty()),
        ('extensions', ExtensionsProperty(spec_version='2.1', enclosing_type=_type)),
        ('spec_version', StringProperty(fixed='2.1')),

class TCPExt(_Extension):
    # TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.
    """

    _type = 'tcp-ext'
    _properties = OrderedDict([
        ('src_flags_hex', HexProperty()),
        ('dst_flags_hex', HexProperty()),
    ])


class NetworkTraffic(_Observable):
    # TODO: Add link
    """For more detailed information on this object's properties, see
    `the STIX 2.1 specification `__.
    """

    _type = 'network-traffic'
    _properties = OrderedDict([
        ('type', TypeProperty(_type)),
        ('id', IDProperty(_type, spec_version='2.1')),
        ('start', TimestampProperty()),
        ('end', TimestampProperty()),
        ('is_active', BooleanProperty()),
        ('src_ref', ReferenceProperty(valid_types=['ipv4-addr', 'ipv6-addr', 'mac-addr', 'domain-name'], spec_version='2.1')),
        ('dst_ref', ReferenceProperty(valid_types=['ipv4-addr', 'ipv6-addr', 'mac-addr', 'domain-name'], spec_version='2.1')),
        ('src_port', IntegerProperty(min=0, max=65535)),
        ('dst_port', IntegerProperty(min=0, max=65535)),